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What are some alternatives?
Slack - A messaging app for teams who see through the Earth!
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
Samepage - Easy to setup collaborative tool and file syncronization cloud application
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.
Bitrix24 - Bitrix24 is a free (for small businesses) social enterprise platform. It is a united work space which handles the many aspects of daily operations and tasks. Create your own social intranet in minutes!
Skype - Stay in touch with your family and friends for free on Skype. Download Skype today to chat and call on desktop and mobile.